Sofa



FIG. 1 is a perspective view of my new sofa design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left, side elevation view, with the right side elevationalview being a mirror image thereof; and,

FIG. 4 is a rear elevation view thereof.

The broken line disclsoure is for illustrative purposes only and formsno part of the claimed design.

The ornamental design for a sofa, as shown and described.